Simplified sound reproducing device driven by a spring motor

Abstract

A winding knob and a winding wheel are supported around a center shaft and are rotatable together in the direction of winding and are also axially movable together without causing axial movement of the center shaft by pushing ahead the winding knob. Between a record disc being urged toward a pickup and movable along the center shaft and the winding wheel, there is provided a slippage preventing post which is placed into engagement with a retaining piece provided on the reverse face of the record by operator's winding motion while depressing the knob but is released from such engagement by the operator's subsequent depression of a starting post and the movement of the record disc away from the pickup. When the record disc returns to its initial position by the operator's releasing of depression, the slippage preventing post moves out of engagement with the locking piece. The starting post is mechanically coupled to a driving source for rotating the record disc so as to play the sounds recorded therein and also serves as an output shaft to other devices outside of the sound reproducing device. In order to stop the record disc concurrently with or immediately after the completion of sound reproduction and also to prevent undesirable turning of the record disc during a winding operation a rotatable pawl member and a stopper pawl member are disposed on the record disc and casing, respectively. By virture of this construction, a sound reproducing device of this type can be operated exactly with a very simplified construction which also enables its driving mechanism to drive other devices disposed outside of the sound reproducing device.

I claim: 
     
       1. A sound reproducing device comprising: a casing;   a center pin mounted upright within the casing;   a record disc having a recorded face thereon with starting and end points of reproduction;   a turntable supported on and axially movable between advanced and retracted positions on the center shaft, the turntable carrying the record disc;   a speaker cone disposed within the casing;   a vibrating plate mounted on the bottom of the speaker cone;   a pickup mounted within the casing for lateral and vertical swinging movement between the vibrating plate and the record disc, the pickup having an upper face capable of slidingly contacting the vibrating plate;   a recording stylus mounted on the pickup and capable of engaging the recorded face of the record disc;   first means for biasing the turntable and the record disc toward the vibrating plate to impart stylus pressure to the reproducing stylus;   second means for biasing the pickup toward both the starting point of sound reproduction on the record disc and away from the recorded face of the record disc;   a winding knob supported on the center shaft and axially movable with respect to the center shaft, the winding knob being movable between winding and retracted directions;   a winding gear wheel capable of being coupled with the winding knob in the direction of winding of the winding knob and axially movable together with the winding knob along the center shaft;   third means for biasing the winding knob and the winding gear wheel toward the retracted direction;   a locking piece integrally formed on the turntable opposite from the side carrying the record disc;   a slippage preventing pole disposed between the winding gear wheel and the record disc and advanced by the winding gear wheel into engagement with the locking piece, the slippage preventing pole being retracted by pushing movement of the record disc when the record disc is in the retracted position and released from engagement with the locking piece when the record disc advances toward the reproducing stylus;   a starting post disposed parallel to the center shaft within the casing;   fourth means for normally biasing the starting post away from the record disc, the starting post being capable of moving the record disc to the retracted position when depressed;   transmission means disposed on top of the center shaft and rotatable with the record disc; and   transmission follower means fixedly attached to the starting post and coupled to the transmission means to enable the starting post to function as a rotatable output shaft.   
     
     
       2. The sound reproducing device as claimed in claim 1, in which each of said power transmission means and said transmission follower means is a gear wheel. 
     
     
       3. The sound reproducing device as claimed in claim 1, in which each of said power transmission means and transmission follower means is a pulley driven by a belt. 
     
     
       4. The sound reproducing device as claimed in claim 1 further including: a sleeve disposed in the casing;   the slippage preventing pole being slidably supported in the sleeve; and   a fifth spring for biasing the slippage preventing pole so that the axial position of the slippage preventing pole can be maintained with respect to said sleeve.   
     
     
       5. The sound reproducing device as claimed in claim 1, in which said record disc can be rotated and axially moved together with said center shaft via the turntable. 
     
     
       6. The sound reproducing devcie as claimed in claim 1, which further comprises, a rotatable pawl member attached to said center shaft and being rotatable and axially movable for advancing and retracting together with said center shaft and, and a stopper pawl member fixedly disposed in said casing, the stopper pawl member being capable of engaging said pawl member in the advanced position so as to stop rotation of said record disc.